Paper slitter



J. R. SPOOR PAPER SLITTER April 15, 1930.

Filed May 1' 1929 31 ffzljv (fan/ ATTORNEY Patented Apr. 15, 1930 PATENT @FFIQE JOHN R. SPOOR, 0F KALAMAZOO, MICHIGAN PAPER SLI'ITER Application filed May 1?, 1929. Serial N... 363,743.

The main objects of this invention are:

First, to improve the action of such paper slitters and insure true cutting and true action of the slitter at all times.

Second, to provide an improved top slitter for a paper slitting machine.

Objects pertaining to details and economies of construction and operation of my invention will definitely appear from the descrip- 1 tion to follow. The invention is defined in of the same in most slitters.

the claims.

A preferred embodiment of the invention is clearly illustrated in .the accompanying drawing, in which:

Fig. 1 is a transverse detail sectional view through apaper slitter, the bottom cutter shaft and the top cutter supporting bar being shown in section.

Fig. 2 is a front sectional view on a line corresponding to line 2-2 of Fig. 1, the cap half of the bearing head being removed.

Fig. 3 is an enlarged detail sectional view on line 3-3 of Fig. 2 showing the adjusting means for the cutter shaft.

Fig.4 is an enlarged detail elevation view of the adjusting pin for throwing the top slitter out of cutting contact.

The parts will be identified by their numerals of reference which are the same in all views.

1 is the bottom shaft of a paper slitter. 2 is the bottom cutter, there being a plurality 3 is the trans verse top cutter supporting bar carrying one or more adjustable brackets 4 which are clamped thereto by set screws 5.

6 is the shank of the top cutter fork and its shank is adjustable in the bracket arm 41 of the set screw 7. 8 is the top disk cutter of usual form supported on a top cutter shaft 81.

9, 9 are the ball hearings in the heads supporting the opposite ends of said shaft. These are carried by the forks 61, 62 which extend into suitable heads 63 for that purpose. Caps 64 are clamped in place by the bolts 64'. A socket 65 is formed in thelefthand head and a compression spring 66 backed up against a bearing button 67 forces the shaft 81 and the top cutter 8 yieldingly into cutting position as seen in Fig'. 2.

The right-hand head 63 is provided with an adjusting pin 10 with a cross handle 101 for manipulating the same. A stop pin 102 is inserted in the main part of the head 63 and engages in an annular groove 103 in the pin 10 to which is connected a longitudinal slot 104 to engage the end of said stop pin.

When the cutter is in use the longitudinal slot 10% engages the pin 102 and permits the spring to force the top cutter yieldingly into cutting position against the bottom cutter. When it is desired to thread in paper the top cutter is moved to the dotted position by forcing the adjusting pin 10 in and turning it so that the stop pin 102 engages the annular groove 103. After the paper is in place the top cutter is simply released by a partial turn of the adjusting pin 10 by means of the handle 101 until the stop pin 102 enters the slot 104 when the top slitter will be forced to position by the spring.

I have shown my improved slitter in the exact form in which I have worked it out, which I believe possesses special advantages. I consequently desire to claim the same in its specific form and I also desire to claim the invention broadly as pointed out in the appended claims.

Having thus described my invention What I claim as new and desire to secure by Letters Patent is:

1. In a paper slitter, the combination of a bottom slitter on a suitable shaft, a top slitter with suitable bracket for supporting the same comprising a supporting fork with bearing heads and ball bearings at each side, a circular top slitter cutter, a shaft for supporting the same extending through the said ball bearings and adjustable therethrough, a socket in one bearing head with a spring and bearing disk therein for forcing the top slitter into engaging position, an adjusting pin with annular and longitudinal slots in its periphery, and a stop pin in the bearing head engaging said slots for adjustment to hold the top slitter out of engagement and permit it on adjustment to be forced into osition by the actuating spring, as specified.

2. A top cutter means for paper slitter comprising a fork with bearing heads on each arm 6 with ball bearings therein at each side, a top slitter cutter, a supporting shaft therefore projecting ends adjustable through the said all bearings, a socket in one bearing head with a spring for forcing the top slitter into 10 cutting position, a bearing-button back of said spring, and an adjusting pin for forcing the said cutter shaft adjustably against the said spring to hold said slitter open, as specified. 3. A top cutter means for a paper slitter comprisin a fork with hearing heads on each arm with l1 bearings therein at each side. a top slitter cutter, a supporting shaft therefor with pro'ecting ends adjustable through the said ball arings, a socket in one bearing head with a spring for forcin the top slitter into cutting position, and an adjusting pin for forcing the said cutter shaft adjustably against the said spring to hold said slitter open, as specified 4. A top slitter comprising a fork, bearings in each member of the fork, a shaft supported in said bearings, a rotary slitter on said shaft, spring means to force the shaft and cutter into cutting position, a cooperating lower slitter and means for adjusting the shaft to open the slitter, as s ecified.

In witness whereof I have iereunto set my hand. 7

JOHN R. SPOOR. 

